ET MALWARE Win32/Vidar Variant/Mars CnC Activity (GET)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Vidar Variant/Mars CnC Activity (GET)";
    flow:established,to_server;
    http.request_line;
    content:"GET /request HTTP/1.1"; bsize:21; fast_pattern;
    http.host;
    pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/";
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Cache-Control|0d 0a|Cookie|0d 0a 0d 0a|"; bsize:33;
    http.header;
    content:"|0d 0a|Cache-Control|3a 20|no-cache|0d 0a|";
    http.cookie;
    content:"PHPSESSID="; startswith;
    pcre:"/^PHPSESSID=[a-z0-9]{26}$/C";
    reference:md5,880924e5583978c615dd03ff89648093;
    reference:url,twitter.com/X__Junior/status/1528046444963323904;
    classtype:trojan-activity;
    sid:2036667; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_05_23, deployment Perimeter, malware_family Win32_Vidar, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_24, reviewed_at 2025_10_24;
)